Downsizing infrared thermometers usually involves sacrificing features and performance. Process Sensors? model PSC-SSS-3M sets a new standard in its uncompromising sophistication and capability. The sensing head, which is only 14 mm diameter by 28 mm in length, facilitates temperature measurement in the confined circumstances often found in industrial processes.

A wide overall temperature span of 50 to 600?C, a narrow spectral response of 2.3?m, and target spot sizes of from 7 to 48 mm or 7 to 73mm dia., depending on the model, particularly suit the sensor to secondary metal processing, and the measurement of oxides and ceramic materials.

Signal processing and programming electronics are contained in a rugged 70 x 89mm housing that allows mounting up to 3m from the sensor, providing greater immunity from electromagnetic interference, mechanical shock, and high ambient temperatures. The sensing head is able to withstand ambient temperatures of up to 85?C without cooling.

Process Sensors Corporation PSC Spot Software? supports sensor set-up, multi-tasking, graphic display of temperature trends and data logging, and in general allows the user to customize the sensor to the application. Detailed specification information can be found at www.processsensorsIR.com

Process Sensors is a private company with manufacturing facility located in Milford, MA. The company is a manufacturer and distributor of non-contact infrared temperature and moisture instruments, and the associated calibration systems.? Technical and application support is provided worldwide through our direct, regional and sales representative offices.

Biosolids are an unavoidable bi-product of sewerage treatment.? However, through careful treatment, Biosolids can be recycled and used effectively as fertilizer and compost as as for combustion processes.? Water must be removed from sludge in order to minimize transportation costs as well as to render it suitable for agricultural or combustion purposes.? This form of sludge is described as sludge “cake.”

Sludge Treatment Processes

The sludge undergoes digestion, a heating process which destroys the bulk of present pathogens prior to passing through large dryers and a pelletizer.? Alternatively, the sludge is “lime stabilized.”? The addition of CaO (lime) to sludge results in a exothermic chemical reaction which eliminates pathogens.

Gauge Location and Installation

Gauge location is dependent on the Treatment Process, however, installation above a belt conveyor, if possible, is simple and effective.? In order to improve measurement performance, the installation of a doctor blade prior to the gauge location, helps to break up and spread the cake solids over the belt, thereby presenting a fresh surface of product to the gauge.? Implementation of two doctor blades (one perpendicular to belt direction and another obluque to the blet) to channel product onto a transfer conveyor will provide the best results.

The % solids readout can be used to control the centrifuge, press and dryer operation as well as the rate of lime addition where applicable.

Measurement Performance

Measurement accuracy is dependent on the composition of the sludge and how variable it is over time, also on the % solids level.? In most instances, however, the % solids reading is accurate to within +/- 0.5%.